946 MR. J. S. GARDINER OX CORALS [DeC. 14, 



of short subequal, much branched stems, not more than 6 mms. 

 apart, 7-15 mms. thick, rather compressed and lobed at the apices. 

 The branches are covered over their summits with extremely 

 obtuse and rounded verrucse, many 5-6 mms. liigh and 4-5 mms. 

 in diameter at their base ; the verrucas on the sides of the branches 

 are scanty and somewhat appressed. The calices are everywhere 

 from 'S-l mm. in diameter and fairly round ; they are generally 

 surrounded by a distinct ring of somewhat flattened spines. The 

 primary and secondary septa in many calices are distinct, rather 

 thin, spiniform lamellae ; they are prolonged inwards and seem to 

 fuse below with the columella, which is generally a distinct, low, 

 broad, granular projection. The ccenenchyma is exceedingly well 

 developed, even between the calices of the verrucje, in which 

 position it is marked by a distinct groove between the cells. The 

 corallum is very dense, the stereoplasm completely filling up the 

 cells below. 



Sandal Bay, Lifu, Loyalty Islands. 



The specimen is a clump S cms. in diameter by 4 cms. high ; 

 with it is growing a colony of Madrepora violacea, the increase of 

 Mhich has killed a part of its clump. The nearest ally to this 

 species seems to be P. clavaria, but its characters are such as to 

 separate it very distinctly from all previously described species. 



12. PocTLLOPORA FAVOSA (Ehrenberg). (Plate LVI. fig. 3.) 



Pocillopora favosa, Ehrenberg. Die Corallenthiere des Eothen 

 Meeres, p. 127. 



I have referred to this species after considerable hesitation 

 several specimens, w hich agree fairly well with Ebrenberg's short 

 description. The corallum forms clumps of much divided branches, 

 which are generally more or less round, but may be slightlv 

 compressed and lobed towards their apices ; diameter of the branch 

 10 cms. below the apes about 1'5 cms., 5 cms. below the apex 

 about I'l cms. Apices of the branches usually about l-l cms. in 

 breadth by "7 cm. in width, completely covered with verrucae, 

 which here and immediately below are from 2-3 Dims, high by 

 1-2 mms. broad, and contain from 6-9 calices. The verrucae 

 lower down on the branches get progressively lower, broader, and 

 more obtuse, until on the main stems they form low projections 

 about 1 mm. high by 4 mms. broad. The cells on the verrucae 

 near the ends of the branches are round or oval in shape, 

 •9-l"l mms. in diameter ; but between the verrucae they are rather 

 smaller, angular, very thin-walled and deep. The ccenenchyma is 

 progressively more developed from the toj) to the bottom of the 

 stems, and is covered by rough, compressed spines, which between 

 the calices may form striations. The primary and secondary- 

 septa are well developed, especially in the calices of the verrucae, 

 but do not project far inwards ; the primaries are especially thick 

 and bluntly spined, the tertiaries are here and there visible. 

 Columella low and bluntly spined, usually distinctly joined, deep 



